MSD 7R SHEARS
Page 18
Section 5
Maintenance
GENERAL BUILD-UP AND
HARDSURFACING
continued
IMPORTANT
1. ALWAYS
hardsurface in the direction of the grain of
the steel (see fi gure 5-6).
2.
Use an air operated slag peener on each pass of all
welds to stress relieve.
3. DO NOT
start and/or stop bead in the apex be-
tween blades.
4.
DO NOT
start and/or stop bead within 1" (25mm) of
a blade bolt hole.
5.
Stagger the ends of the adjacent beads.
DO NOT
stop or start beads in a straight line with each other.
6.
Grind end of hardsurfacing bead smooth, tapering
for 1-1/4" to 1-1/2" (31-38mm) to parent material.
DO
NOT
undercut with grinder. Grind marks going with
the grain.
7.
DO NOT
hardsurface into the throat area of the low-
er or upper shear; doing so can cause surface cracks
which may develop into major structural failures.
8.
Check temperature frequently to maintain 300-
400ºF (150-200ºC).
DO NOT
exceed 450ºF (230ºC).
9. NEVER
operate a shear following repairs without
fi rst allowing it to cool slowly to ambient temperature.
FIGURE 5-6
APEX
STAGGER WELDS
THROAT
Paint removal and grinding can be hazardous and cause personal injury.
• Remove paint before welding or heating. Hazardous fumes can be generated when paint is heated.
• If you sand or grind paint, avoid breathing the dust. Wear an approved respirator.
• If you use solvent or paint stripper, remove stripper with soap and water before welding. Remove
solvent, paint stripper containers and other fl ammable material from area.
• Provide a fi re extinguisher during all cutting and welding operations. Clean areas to be cut or
welded of oil and fl ammable materials. Protect all fl ammable areas from sparks.
• Do all work in a well-ventilated area. Dispose of paint and solvent properly.
DIRECTION OF GRAIN
